Re: [PATCH 0/2] some block and scsi layer additions for ULD scatterlist code

[Mike Christie <michaelc@cs.wisc.edu>]

Yanggun wrote:
> Hi,
> 
> i am currently using linux kernel version 2.6.15-rc5 on x86 with Promise
> SATAII150 TX2Plus(250G SATA HDD Disk x 2).
> 
> But, SATA HDD disk does not become. program execute result of "fdisk
> /dev/sda" is  "Unable to read /dev/sda".
> 
> Work well in linux kernel version 2.6.13.2.
> 
> Do not act below since change as result that do debugging.
>       "[SCSI] use scatter lists for all block pc requests and
> simplify hw handlers"
>       -  http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=392160335c798bbe94ab3aae6ea0c85d32b81bbc
> 
> 
> Test and tried your bug patch,  but, result is same.

I do not think my patch was meant to address your issue :(

> 
> By result that I do debugging, if queuecommand () of LLD layer returns
> result properly, but execute scsi_probe_lun () -> scsi_execute_req ()
> -> blk_execute_rq ()  by thing which is not realized to proc/scsi/scsi
> come out . after execute blk_execute_rq(), then cmd->buffer,
> cmd->request_buffer is NULL. so, "Model:"  in scsi_add_lun() ->
> print_inquiry() comes out NULL.

I am not sure I understand correctly, but I do not think the analysis 
above is completely correct. scsi_execute_req gets a buffer passed to it 
so it should not matter if those fields are set to NULL when 
scsi_execute_req completes as long as something has been copied to the 
buffer passed into scsi_execute_req.

> --------------
> Kernel version: 2.6.15-rc5
> SATA Controller: Promise SATAII150 TX2Plus
> SATA HDD: Western Digital 250G x 2
> SATA Driver: http://www.promise.com/support/download/download2_eng.asp?productID=126&category=all&os=100#
> 

I am not too familar with SATA. Is this driver in mainline and does it 
use libata? Which module is it?